One of his masterpieces, Tetsuwan ATOM (Astro Boy), became the first domestically produced 30-minute TV anime series in Japan. Tezuka not only drew the original manga but also handled the animation production. He adopted a method called “limited animation” requiring simplified motion while allowing the story itself to bring true strength to the work. This labor-saving technique had an enormous influence on subsequent Japanese anime works. Ribon no Kishi (Princess Knight), inspired by watching many performances of the all-girl Takarazuka Revue, helped establish a genre called “girl manga.” Black Jack, which drew on his knowledge as a medical doctor, helped launch the medical manga genre.